José Muñoz, former chairman of Nissan North America, resigned from the company Friday, as former Nissan executives Carlos Ghosn and Greg Kelly face new charges in Japan, according to Nissan.

Muñoz's resignation is effective immediately, said Nissan spokesman Brian Brockman. Brockman declined to provide any more information on why Muñoz resigned or whether his resignation was related to the Ghosn investigation.

In a LinkedIn post, Muñoz said he chose to leave the company.

"My decision to leave Nissan was reached after much reflection and careful consideration," Muñoz wrote. "Unfortunately, Nissan is currently involved in matters that have and will continue to divert its focus."

Ghosn faced charges on Jan. 11 of misusing the company's funds for personal gain, and Nissan said in a statement the company filed a criminal complaint against him based on the same violation. The company, along with Ghosn and Kelly, have also been indicted for making false disclosures in annual reports.

"Nissan takes this situation extremely seriously and expresses its deepest regret for any concern caused to its stakeholders," the company said in a statement.

Both Ghosn and Kelly have said they were wrongly accused.

Muñoz said in his LinkenIn post that he would cooperate with Nissan's investigations, as he expressed love for his former companies and colleagues.

"I’ve been honored to be part of Nissan’s growth and return to prosperity over my fourteen-year career there," he said. "As I have repeatedly and recently made clear to the company, I look forward to continuing to assist Nissan in its investigations," he wrote.

Muñoz served as chief performance officer of Nissan Motor Co. since 2016. From 2014 to January 2018, he served as chairman of the North America operations, which is headquartered in Franklin and employs about 12,000 people in Middle Tennessee.

Muñoz and his wife, Julia Manchón, own a home in Brentwood, according to property records.

Jose Munoz is chairman of Nissan North America.(Photo: Courtesy of Nissan)

Kelly was moved to a hospital after being released and is awaiting surgery for conditions tied to spinal stenosis, his Nashville lawyer Aubrey Harwell Jr. said. He has not been allowed to leave Japan, so he is exploring surgery options there. A trial could begin as early as March or April after Kelly recovers from surgery, Harwell said.

Muñoz, born in Spain, reported to Nissan CEO Hiroto Saikawa and was responsible for the company’s overall results. Under his leadership as chairman, Nissan generated record sales in the U.S. in 2016 and 2017, according to the company’s site.

Muñoz was among local officials who announced that Nissan bought naming rights to the Titans' stadium in 2015. He also announced Nissan's decision to launch production of its new LEAF model at its Smyrna plant in 2017.

Prior to his North America role, Muñoz led Nissan Mexicana as president. He joined Nissan in 2004 as a general manager at Nissan Europe.

Denis Le Vot is now North America chairman for Nissan. Nissan has not named a replacement for Muñoz in his global role, Brockman said.